U.S. patent application number 15/734152 was filed with the patent office on 2022-03-10 for transportation refrigeration system, for transportation vehicle, control method thereof and electric transportation vehicle.
The applicant listed for this patent is Carrier Corporation. Invention is credited to Linhui Chen, Yiming Wen, Pu Zheng.
Application Number | 20220072931 15/734152 |
Document ID | / |
Family ID | |
Filed Date | 2022-03-10 |
United States Patent
Application |
20220072931 |
Kind Code |
A1 |
Chen; Linhui ; et
al. |
March 10, 2022 |
TRANSPORTATION REFRIGERATION SYSTEM, FOR TRANSPORTATION VEHICLE,
CONTROL METHOD THEREOF AND ELECTRIC TRANSPORTATION VEHICLE
Abstract
A transport refrigeration system, a control method therefor and
an electric transport vehicle are provided by the present
disclosure. The control method for the transport refrigeration
system includes: if a ratio of a current battery charge amount to a
minimum battery charge amount is not less than a first preset
value, controlling power consuming units in the transport
refrigeration system to operate in a power-unrestricted state; and
if the ratio of the current battery charge amount to the minimum
battery charge amount is less than the first preset value,
controlling the power consuming units in the transport
refrigeration system to operate in a power-restricted state;
wherein the power-restricted state is associated with the ratio of
the current battery charge amount to the minimum battery charge
amount.
Inventors: |
Chen; Linhui; (Shanghai,
CN) ; Wen; Yiming; (Shanghai, CN) ; Zheng;
Pu; (Shanghai, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Carrier Corporation |
Palm Beach Gardens |
FL |
US |
|
|
Appl. No.: |
15/734152 |
Filed: |
May 22, 2020 |
PCT Filed: |
May 22, 2020 |
PCT NO: |
PCT/US2020/034188 |
371 Date: |
December 1, 2020 |
International
Class: |
B60H 1/32 20060101
B60H001/32; G01R 31/382 20060101 G01R031/382 |
Foreign Application Data
Date |
Code |
Application Number |
May 28, 2019 |
CN |
201910451000.6 |
Claims
1. A control method for a transport refrigeration system,
comprising: if a ratio of a current battery charge amount to a
minimum battery charge amount is not less than a first preset
value, controlling power consuming units in the transport
refrigeration system to operate in a power-unrestricted state; and
if the ratio of the current battery charge amount to the minimum
battery charge amount is less than the first preset value,
controlling the power consuming units in the transport
refrigeration system to operate in a power-restricted state;
wherein the power-restricted state is associated with the ratio of
the current battery charge amount to the minimum battery charge
amount.
2. The control method according to claim 1, wherein when the ratio
of the current battery charge amount to the minimum battery charge
amount is less than the first preset value, if the ratio of the
current battery charge amount to the minimum battery charge amount
is greater than a second preset value, the power consuming units in
the transport refrigeration system are controlled to operate in a
first power-restricted state; at this point, the power supply
amounts to and the maximum operating speeds of a compressor and a
condenser fan of the power consuming units are limited, and a
cooling capacity generated by the transport refrigeration system is
capable of maintaining the compartment of the electric transport
vehicle at a set temperature.
3. The control method according to claim 2, wherein when the ratio
of the current battery charge amount to the minimum battery charge
amount is not greater than the second preset value, if the ratio of
the current battery charge amount to the minimum battery charge
amount is greater than a third preset value, the power consuming
units in the transport refrigeration system are controlled to
operate in a second power-restricted state; at this point, the
power supply amounts to the compressor and the condenser fan of the
power consuming units are limited to minimum power supply amounts,
the operating speeds of the compressor and the condenser fan are
limited to minimum operating speeds, and the cooling capacity
generated by the transport refrigeration system is capable of
maintaining the compartment of the electric transport vehicle close
to the set temperature.
4. The control method according to claim 3, wherein when the ratio
of the current battery charge amount to the minimum battery charge
amount is not greater than the third preset value, if the ratio of
the current battery charge amount to the minimum battery charge
amount is greater than a fourth preset value, the power consuming
units in the transport refrigeration system are controlled to
operate in a third power-restricted state; at this point, the power
supply amounts to the compressor and the condenser fan of the power
consuming units are limited to 0, but a power supply amount to an
evaporator fan maintains normal to drive air in the compartment of
the electric transport vehicle to flow.
5. The control method according to claim 4, wherein when the ratio
of the current battery charge amount to the minimum battery charge
amount is not greater than the fourth preset value, the power
consuming units in the transport refrigeration system are
controlled to operate in a fourth power-restricted state; at this
point, the power supply amounts to the compressor, the condenser
fan and the evaporator fan of the power consuming units are limited
to 0.
6. The control method according to claim 5, wherein when the power
consuming units in the transport refrigeration system operate in
the fourth power-restricted state, a power supply amount to a
temperature display screen of the power consuming units maintains
normal to display a current temperature in the compartment of the
transport vehicle.
7. The control method according to claim 5, wherein the first
preset value is 2.5; and/or the second preset value is 1.5; and/or
the third preset value is 1; and/or the fourth preset value is
0.9.
8. The control method according to claim 1, wherein the power
consuming units in the transport refrigeration system are powered
by a power battery of the transport vehicle.
9. A transport refrigeration system, which is configured to adjust
an internal temperature of a vehicle compartment of an electric
transport vehicle, wherein the refrigeration system comprises an
evaporator and an evaporator fan that are disposed inside the
vehicle compartment, a condenser, a condenser fan, a compressor and
a throttling element that are disposed outside the vehicle
compartment, the compressor, the condenser, the throttling element
and the evaporator being connected in sequence to form a
refrigeration circuit; and a control module configured to control a
battery of the electric transport vehicle to supply power to the
evaporator fan, the condenser fan, and the compressor; wherein the
control module controls the refrigeration system according to the
control method according to claim 1.
10. An electric transport vehicle, comprising: the transport
refrigeration system according to claim 9; and a power battery;
wherein the power battery supplies power for the vehicle and power
consuming units in the transport refrigeration system
simultaneously.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of CN Application No.
201910451000.6, filed on May 28, 2019, which is incorporated herein
by reference in its entirety.
FIELD OF THE INVENTION
[0002] The present disclosure relates to the field of transport
refrigeration, and in particular, to a refrigeration system for an
electric transport vehicle and a control method thereof.
BACKGROUND OF THE INVENTION
[0003] Transport vehicles for cold chain distribution are typically
equipped with a dedicated transport refrigeration system. Such a
refrigeration system typically includes a compressor, a condenser,
an evaporator, an expansion valve, and other auxiliary components
that constitute a refrigeration circuit. The evaporator of the
refrigeration system is arranged in a compartment of the transport
vehicle for providing a constant-temperature preservation space for
the goods to be transported in the vehicle compartment, such as
refrigerating preservation or freezing preservation. Such transport
vehicles and their refrigeration systems can be powered by diesel,
petrol or new energy sources. For example, with the development of
new energy sources, some transport vehicles can use power batteries
to provide power for transport vehicles and their transport
refrigeration systems. During the operation of the vehicle and
transport refrigeration system, the power is continuously consumed
until its battery charge reaches a minimum set threshold, which
means that the vehicle's power battery will have to be charged. If
the battery continues to be used until the charges are exhausted,
the vehicle will be unable to run or even the battery will be
damaged. To avoid such problems, there is currently a type of
solution that shuts down the transport refrigeration system when
the battery charge reaches a minimum set threshold. In this case,
although the travelling duration of the vehicle is prolonged, the
insulation temperature in the vehicle compartment will be out of
control, which will rise rapidly, affecting the quality of the
goods, or even causing deterioration and damage of the goods.
SUMMARY OF THE INVENTION
[0004] The present disclosure aims to provide a control method for
a transport refrigeration system, which is capable of balancing
power distribution of a power battery between power consuming units
of a refrigeration system and a transport vehicle. The present
disclosure also aims to provide a transport refrigeration system
having: components and hardware modules capable of performing the
aforementioned control method; and an electric transport vehicle
having the transport refrigeration system.
[0005] In order to achieve at least one object of the present
disclosure, a control method for a transport refrigeration system
is provided according to an aspect of the present disclosure, which
includes: if a ratio of a current battery charge amount to a
minimum battery charge amount is not less than a first preset
value, controlling power consuming units in the transport
refrigeration system to operate in a power-unrestricted state; and
if the ratio of the current battery charge amount to the minimum
battery charge amount is less than the first preset value,
controlling the power consuming units in the transport
refrigeration system to operate in a power-restricted state;
wherein the power-restricted state is associated with the ratio of
the current battery charge amount to the minimum battery charge
amount.
[0006] Optionally, when the ratio of the current battery charge
amount to the minimum battery charge amount is less than the first
preset value, if the ratio of the current battery charge amount to
the minimum battery charge amount is greater than a second preset
value, the power consuming units in the transport refrigeration
system are controlled to operate in a first power-restricted state;
at this point, the power supply amounts to and the maximum
operating speeds of a compressor and a condenser fan of the power
consuming units are limited, and a cooling capacity generated by
the transport refrigeration system is capable of maintaining the
compartment of the electric transport vehicle at a set
temperature.
[0007] Optionally, when the ratio of the current battery charge
amount to the minimum battery charge amount is not greater than the
second preset value, if the ratio of the current battery charge
amount to the minimum battery charge amount is greater than a third
preset value, the power consuming units in the transport
refrigeration system are controlled to operate in a second
power-restricted state; at this point, the power supply amounts to
the compressor and the condenser fan of the power consuming units
are limited to minimum power supply amounts, the operating speeds
of the compressor and the condenser fan are limited to minimum
operating speeds, and the minimum power supply amounts enable the
cooling capacity generated by the transport refrigeration system to
be capable of maintaining the compartment of the electric transport
vehicle close to the set temperature.
[0008] Optionally, when the ratio of the current battery charge
amount to the minimum battery charge amount is not greater than the
third preset value, if the ratio of the current battery charge
amount to the minimum battery charge amount is greater than a
fourth preset value, the power consuming units in the transport
refrigeration system are controlled to operate in a third
power-restricted state; at this point, the power supply amounts to
the compressor and the condenser fan of the power consuming units
are limited to 0, but a power supply amount to an evaporator fan
maintains normal to drive air in the compartment of the electric
transport vehicle to flow.
[0009] Optionally, when the ratio of the current battery charge
amount to the minimum battery charge amount is not greater than the
fourth preset value, the power consuming units in the transport
refrigeration system are controlled to operate in a fourth
power-restricted state; at this point, the power supply amounts to
the compressor, the condenser fan and the evaporator fan of the
power consuming units are limited to 0.
[0010] Optionally, when the power consuming units in the transport
refrigeration system operate in the fourth power-restricted state,
a power supply amount to a temperature display screen of the power
consuming units maintains normal to display a current temperature
in the compartment of the transport vehicle.
[0011] Optionally, the first preset value is 2.5; and/or the second
preset value is 1.5; and/or the third preset value is 1; and/or the
fourth preset value is 0.9.
[0012] Optionally, the power consuming units in the transport
refrigeration system are powered by a power battery of the electric
transport vehicle.
[0013] To achieve at least one object of the present disclosure, a
transport refrigeration system is provided according to another
aspect of the present disclosure, which is configured to adjust an
internal temperature of a vehicle compartment of an electric
transport vehicle, wherein the refrigeration system includes an
evaporator and an evaporator fan that are disposed inside the
vehicle compartment, a condenser, a condenser fan and a compressor
that are disposed outside the vehicle compartment; and a control
module configured to control a battery of the electric transport
vehicle to supply power to the evaporator fan, the condenser fan,
and the compressor; wherein, if a ratio of a current battery charge
amount to a minimum battery charge amount is not less than a first
preset value, the control module controls power consuming units in
the transport refrigeration system to operate in a
power-unrestricted state; and if the ratio of the current battery
charge amount to the minimum battery charge amount is less than the
first preset value, the control module controls the power consuming
units in the transport refrigeration system to operate in a
power-restricted state; and wherein the power-restricted state is
associated with the ratio of the current battery charge amount to
the minimum battery charge amount.
[0014] In order to achieve at least one object of the present
disclosure, an electric transport vehicle is further provided
according to still another aspect of the present disclosure, which
includes: the transport refrigeration system as described above;
and a power battery; wherein the power battery supplies power for
the vehicle and power consuming units in the transport
refrigeration system simultaneously.
[0015] According to the control method for the transport
refrigeration system of the present disclosure, a power supplying
state of the power battery is determined by analyzing the ratio of
the current battery charge amount to the minimum battery charge
amount, so that the power consuming units in the transport
refrigeration system can be controlled to operate in a
power-unrestricted state or a power-restricted state, and the
degree of the power-restricted state is associated with the ratio
of the battery charge amount to the minimum battery charge amount,
thereby ensuring that power consumption of the transport
refrigeration system is gradually reduced as the remaining power of
the power battery is reduced. On one hand, the influence of a
sudden change of temperature on the goods in the vehicle
compartment is avoided, and on the other hand, the travelling
duration of the vehicle is prolonged as much as possible, thus
achieving a better balance between preservation of goods and
vehicle operation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG. 1 is a schematic diagram of a control flow of an
embodiment of a control method for a transport refrigeration system
of the present disclosure.
DETAILED DESCRIPTION OF THE EMBODIMENT(S) OF THE INVENTION
[0017] The present disclosure herein provides an embodiment of a
control method for a transport refrigeration system. The transport
refrigeration system may have conventional components in existing
transport refrigeration systems, including a compressor, a
condenser, a throttling element, and an evaporator that are
connected in sequence to form a refrigeration circuit. The
condenser and the evaporator respectively have a condenser fan and
an evaporator fan that are configured to drive air to flow through
the surfaces of the condenser and evaporator for heat exchange. For
the transport refrigeration system, it has at least the compressor,
the condenser fan and the evaporator fan as power consuming units,
the power consumption of which cannot be ignored. Therefore, if it
is necessary to limit the power output of the power battery to the
transport refrigeration system in some application situations and
the power should be supplied to the transport vehicle as much as
possible, then the power supply to part of at least the above power
consuming units in the transport refrigeration system should be
restricted as needed.
[0018] As a way of coordinating power supply distribution of a
power battery between the transport vehicle and the refrigeration
system, the control method focuses on how to limit the power supply
to the transport refrigeration system to extend the travelling
duration of the transport vehicle, in a case that the power battery
is in a low charge state, while causing no sudden change in the
insulation temperature in the compartment and deterioration and
damage of the goods caused thereby, etc.
[0019] Specifically, referring to FIG. 1, as an embodiment of the
control method, the method includes the following step: if a ratio
of a current battery charge amount to a minimum battery charge
amount is not less than a first preset value, for example, not less
than 2.5, it indicates that the current battery power reserve is
far higher than a warning value set by the battery manufacturer or
the user. In this situation, there is no need to worry about the
vehicle's mileage problem, so there is no need to impose any
restriction on the power consuming units in the transport
refrigeration system. They can operate in a power-unrestricted
state so that the power consuming units in the system can be
supplied power according to actual needs. For example, to ensure
that the temperature inside the vehicle compartment is quickly
adjusted to a set temperature, the power supply to the power
consuming units in the system can be increased to a rated maximum
value so that the compressor can operate at full capacity for
providing cooling, and the volume of air flowing through the
condenser and the evaporator is kept at the maximum to provide high
heat exchange efficiency; for example, after the compartment
temperature is adjusted to a set temperature, the power supply to
the power consuming units in the system can be reduced
correspondingly, so long as the compressor, the condenser fan and
the evaporator fan or other power consuming units can be maintained
in an appropriate operating state and it can be ensured that the
temperature inside the vehicle compartment is stably maintained
near the set temperature.
[0020] In addition, if the ratio of the current battery charge
amount to the minimum battery charge amount is less than the first
preset value, for example, less than 2.5, it indicates that the
current battery power reserve is close to a warning value set by
the battery manufacturer or the user, and now more power may be
supplied to the transport vehicle, while the power consuming units
in the transport refrigeration system are controlled to operate in
a power-restricted state, and the power-restricted state is
associated with the ratio of the battery charge amount to the
minimum battery charge amount. That is, the degree or proportion of
power supply to the transport refrigeration system should be
gradually reduced according to the remaining charge amount that is
continuously decreasing.
[0021] This control method determines the power supply state of the
power battery by analyzing the ratio of the current battery charge
to the minimum battery charge, and then starts to coordinate the
power supply distribution of the power battery to the vehicle and
the refrigeration system before the charge of the power battery
reaches a warning line. The power consuming units in the transport
refrigeration system are controlled as needed to operate in a
power-unrestricted state or a power-restricted state, and the
degree of the power-restricted state of the power-consuming units
is associated with the ratio of the battery charge amount to the
minimum battery charge amount. This provides a more stable
adjustment manner to ensure that the power consumption of the
transport refrigeration system is gradually reduced as the
remaining charge of the power battery is decreasing. On one hand,
the influence of a sudden change of temperature on the goods in the
vehicle compartment is avoided, and on the other hand, the
travelling duration of the vehicle is prolonged as much as
possible, thus achieving a better balance between preservation of
goods and vehicle operation.
[0022] It is mentioned in the above embodiment that the
power-restricted state of the power consuming units can be
associated with the ratio of the battery charge amount to the
minimum battery charge amount. Several examples are additionally
provided herein in combination with FIG. 1 to describe how to
adjust the degree of power-restricted state of the power consuming
units based on the ratio of battery charge amount to the minimum
battery charge amount.
[0023] For example, when the ratio of the current battery charge
amount to the minimum battery charge amount is less than the first
preset value, for example, less than 2.5, if the ratio of the
current battery charge amount to the minimum battery charge amount
is further greater than a second preset value, for example, greater
than 1.5, then it indicates that the current battery power reserve
is initially close to the warning value set by the battery
manufacturer or the user, and now more power may be gradually
supplied to the transport vehicle, so the power consuming units in
the transport refrigeration system may be controlled to operate in
a first power-restricted state. At this point, the power supply
amount to the compressor and the condenser fan of the power
consuming units will be limited to a value lower than a rated
maximum power supply amount, so that the maximum operating speeds
of them are limited, but at this power supply amount and the
corresponding operating speeds, the cooling capacity generated by
the transport refrigeration system can still maintain the
compartment of the electric transport vehicle at a required
temperature.
[0024] For example, as the vehicle continues to run and the
refrigeration system continues to operate, when the ratio of the
current battery charge amount to the minimum battery charge amount
is not greater than the second preset value, for example, not
greater than 1.5, if the ratio of the current battery charge amount
to the minimum battery charge amount is greater than a third preset
value, for example, greater than 1, then it indicates that the
current battery power reserve is extremely close to or even reaches
the warning value set by the battery manufacturer or the user, and
a greater more power should be supplied to the transport vehicle,
so the power consuming units in the transport refrigeration system
may be controlled to operate in a second power-restricted state. At
this point, the power supply amount to the compressor and the
condenser fan of the power consuming units is be limited to a
minimum power supply amount, the operating speeds of the compressor
and the condenser fan are limited to minimum operating speeds, and
the cooling capacity generated by the transport refrigeration
system can maintain the compartment of the electric transport
vehicle close to a set temperature.
[0025] For another example, as the vehicle continues to run and the
refrigeration system continues to operate, when the ratio of the
current battery charge amount to the minimum battery charge amount
is not greater than the third preset value, for example, not
greater than 1, if the ratio of the current battery charge amount
to the minimum battery charge amount is greater than a fourth
preset value, for example, greater than 0.9, then it indicates that
the current battery power reserve begins to fall below the warning
value set by the battery manufacturer or the user, and the
remaining power reserve is extremely limited; at this point,
consideration should be given to shut down some of the power
consuming units of the transport refrigeration system in order to
maintain the running of the vehicle as much as possible, so the
power consuming units in the transport refrigeration system may be
controlled to operate in a third power-restricted state. At this
point, the power supply amount to the compressor and the condenser
fan of the power consuming units is be limited to 0, but a power
supply amount to the evaporator fan maintains normal to drive air
in the compartment of the electric transport vehicle to flow.
[0026] For still another example, when the ratio of the current
battery charge amount to the minimum battery charge amount is not
greater than the fourth preset value, for example, not greater than
0.9, then it indicates that the current battery power reserve is
low enough to require immediate charging, otherwise the vehicle may
stop running or the battery may even be damaged. At this point,
consideration should be given to shut down the
mainly-power-consuming unit of the transport refrigeration system
to maintain the running of the vehicle as much as possible so that
the vehicle can reach the charging station, so the power consuming
units in the transport refrigeration system may be controlled to
operate in a fourth power-restricted state. At this point, the
power supply amount to the compressor, the condenser fan and the
evaporator fan of the power consuming units is be limited to 0. In
view of the fact that in some cases, some goods may still be
preserved in the compartment, in order to know in real time the
preservation condition of the goods in the compartment, when the
power consuming units in the transport refrigeration system are
operating in the fourth power-restricted state, a power supply
amount to a temperature display screen of the power consuming units
which consumes very little power can maintains normal to display
the current temperature of the compartment of the electric
transport vehicle.
[0027] While specific values of the preset values of determination
steps in the method are described in the embodiment of the
foregoing control method in combination with FIG. 1, it should be
understood that the foregoing values are set for illustrative
purposes. In light of the teachings of the present disclosure,
those skilled in the art can adjust the aforementioned preset
values without creative efforts to meet the actual requirements of
different transport refrigeration systems, different transport
vehicles, and power batteries of different specifications.
[0028] Moreover, although not shown in the drawings, an embodiment
of a transport refrigeration system is also provided herein by the
present disclosure, which is configured to adjust an internal
temperature of a vehicle compartment of an electric transport
vehicle. Generally, it includes at least an evaporator and an
evaporator fan that are disposed inside the vehicle compartment, a
condenser, a condenser fan and a compressor that are disposed
outside the vehicle compartment; and a control module configured to
control a battery of the electric transport vehicle to supply power
to the evaporator fan, the condenser fan, and the compressor,
wherein the control module can make restricted or unrestricted
power supply control over power consuming units in the transport
refrigeration system based on the power storage degree of the power
battery.
[0029] For example, if the ratio of the current battery charge
amount to the minimum battery charge amount is not less than the
first preset value, it indicates that the current battery power
reserve is still far higher than the warning value set by the
battery manufacturer or the user. In this situation, there is no
need to worry about the vehicle's mileage problem, so there is no
need to impose any restriction on the power consuming units in the
transport refrigeration system. They can operate in a
power-unrestricted state so that the power consuming units in the
system can be supplied power according to actual needs. For
example, to ensure that the temperature inside the vehicle
compartment is quickly adjusted to a set temperature, the power
supply to the power consuming units in the system can be increased
to a rated maximum value so that the compressor can operate at full
capacity for providing cooling, and the volume of air flowing
through the condenser and the evaporator is kept at the maximum to
provide high heat exchange efficiency; for example, after the
compartment temperature is adjusted to a set temperature, the power
supply to the power consuming units in the system can be reduced
correspondingly, so long as the compressor, the condenser fan and
the evaporator fan or other power consuming units can be maintained
in an appropriate operating state and it can be ensured that the
temperature inside the vehicle compartment is stably maintained
near the set temperature.
[0030] If the ratio of the current battery charge amount to the
minimum battery charge amount is less than the first preset value,
for example, less than 2.5, it indicates that the current battery
power reserve is close to a warning value set by the battery
manufacturer or the user, and now more power may be supplied to the
transport vehicle, while the power consuming units in the transport
refrigeration system are controlled to operate in a
power-restricted state, and the power-restricted state is
associated with the ratio of the battery charge amount to the
minimum battery charge amount. That is, the degree or proportion of
power supply to the transport refrigeration system should be
gradually reduced according to the remaining charge amount that is
continuously decreasing.
[0031] The transport refrigeration system determines the power
supply state of the power battery by analyzing the ratio of the
current battery charge amount to the minimum battery charge amount,
and then starts to coordinate the power supply distribution of the
power battery to the vehicle and the refrigeration system before
the charge of the power battery reaches a warning line. The power
consuming units in the transport refrigeration system are
controlled as needed to operate in a power-unrestricted state or a
power-restricted state, and the degree of the power-restricted
state of the power-consuming units is associated with the ratio of
the battery charge amount to the minimum battery charge amount.
This provides a more stable adjustment manner to ensure that the
power consumption of the transport refrigeration system is
gradually reduced as the remaining charge of the power battery is
decreasing. On one hand, the influence of a sudden change of
temperature on the goods in the vehicle compartment is avoided, and
on the other hand, the travelling duration of the vehicle is
prolonged as much as possible, thus achieving a better balance
between preservation of goods and vehicle operation.
[0032] Moreover, although not shown in the drawings, an electric
transport vehicle is herein further provided by the present
disclosure, which includes the transport refrigeration system of
any of the foregoing embodiments or combinations thereof, and a
power battery. The power battery supplies power for the vehicle and
power consuming units in the transport refrigeration system
simultaneously. The electric transport vehicle of this arrangement
can also start to coordinate the power supply distribution of the
power battery to the vehicle and the refrigeration system before
the charge of the power battery reaches a warning line, ensuring
that the power consumption of the transport refrigeration system is
gradually reduced as the remaining charge of the power battery is
decreasing. On one hand, the influence of a sudden change of
temperature on the goods in the vehicle compartment is avoided, and
on the other hand, the travelling duration of the vehicle is
prolonged as much as possible, thus achieving a better balance
between preservation of goods and vehicle operation. No repeated
detailed description is given herein.
[0033] The power supply coordination of the electric transport
vehicle to which the control method for the transport refrigeration
system in the foregoing embodiment is applied in a delivery process
will be described with reference to FIG. 1 as follows.
[0034] First of all, when scheduling the delivery by an electric
transport vehicle, such as an electric refrigeration vehicle, a
longer mileage of it and more goods to be delivered should be
expected as much as possible. Before the refrigeration vehicle
starts to deliver, the power battery is in a full-charge state. At
this point, the vehicle compartment is pre-cooled to a set
temperature within the shortest duration, and a cooler is required
to provide a maximum cooling capacity, so a maximum operable
rotating speed of a variable frequency compressor is not limited
(for example, 6000 RPM), and at the same time, a maximum operable
rotating speed of a variable frequency condenser fan is also not
limited (for example, 3000 RPM) to ensure a normal operation of the
refrigeration system, thereby rapidly cooling the vehicle
compartment to the set temperature.
[0035] Subsequently, goods are loaded and delivered, and the cooler
now is in an operational state. After the refrigeration vehicle has
delivered the goods for a period of time, the charge of the power
battery is reduced, and the amount of goods in the compartment is
reduced. At this point, the goods are maintained at the set
temperature, and the maximum cooling capacity is not required, so
that power supply of the power battery to the power consuming units
in the transport refrigeration system can be reduced. At this
point, the maximum operable rotating speed of the compressor will
be limited to an intermediate speed (for example, 4200 RPM), and
the maximum operable rotating speed of the variable frequency
condenser fan will also be reduced accordingly (for example, 2200
RPM).
[0036] Thereafter, as the refrigeration vehicle continues to
deliver goods, the charge of the power battery continues to drop
and the goods are further reduced, which will also result in a
further reduction in the cooling capacity required to maintain the
temperature of the goods. Therefore, power supply of the power
battery to the power consuming units in the transport refrigeration
system can be reduced again. At this point, the rotating speed of
the variable frequency compressor in operation will be limited to a
minimum speed (for example, 1800 RPM), and the rotating speed of
the variable frequency condenser fan in operation will also be
limited to a minimum speed (for example, 1000 RPM).
[0037] Furthermore, as the goods are further reduced and the charge
of the power battery is further reduced, in order to ensure that
the refrigeration vehicle can continue to run, the compressor of
the refrigeration system will be controlled to stop operation, the
condenser fan will be controlled to stop operation, and only the
operation of the evaporator fan is maintained, thereby driving the
air in the vehicle compartment in circulation.
[0038] Eventually, when the electric refrigeration vehicle's power
drops to a degree where it is remained to charge, the compressor,
the condenser fan, and the evaporator fan of the refrigeration
system will all be controlled to stop operation. At this point, in
order to ensure that the user can also know the insulation
condition of the remaining goods in the compartment, power supply
to the temperature display screen in the system can be continued,
so that it can continue displaying the temperature inside the
compartment.
[0039] The transport refrigeration system, the control method
therefor and the electric transport vehicle according to the
present disclosure are mainly described in the above examples.
While only some of the embodiments of the present disclosure have
been described, those skilled in the art will understand that the
present disclosure can be carried out in many other forms without
departing from the spirit and scope thereof Therefore, the
illustrated examples and embodiments should be considered as
illustrative rather than limiting, and the present disclosure can
cover various modifications and replacements without departing from
the spirit and scope of the present disclosure defined by
individual appended claims.
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